Headphone with speaker function

Abstract

A headphone with speaker function comprises a first playback unit, a second playback unit, a first audio source interface and a second audio source interface. Both the first playback unit and the second playback units have a speaker respectively. The first audio source interface is disposed on the first playback unit and is electrically connected to the two speakers simultaneously, while the second audio source interface can be disposed on the first playback unit or the second playback unit, and is electrically connected to the two speakers simultaneously via an amplifier circuit. From an external audio interface, an audio signal is transmitted to the headphone via the first audio source interface; at this moment, the headphone set is operated under a headphone mode. From an external audio interface, an audio signal is transmitted via the second audio source interface; at this moment, the headphone is operated under a speaker mode.

What is claimed is: 
     
       1. A headphone with speaker function, comprising:
 a first playback unit having a first speaker for playing sound; 
 a second playback unit having a second speaker for playing sound; 
 a first audio source interface disposed on the first playback unit, and is electrically connected to the first speaker and the second speaker; and 
 a second audio source interface disposed on the first playback unit or the second playback unit, and is electrically connected to the first speaker and the second speaker via an amplifier circuit; 
 wherein when an audio signal is transmitted from an external audio interface via the first audio source interface, the headphone is operated under a headphone mode, and the audio signal is playback via the first speaker and the second speaker, when an audio signal is transmitted from the external audio interface via the second audio source interface, the headphone is operated under a speaker mode, and the audio signal is playback via the first speaker and the second speaker after the audio signal is amplified by the amplifier circuit; 
 wherein the first playback unit and the second playback unit are connected to each other by a head band, a fork portion is disposed at each end of the head band for clamping the first playback unit and the second playback unit respectively, when the headphone is operated under the headphone mode, sound output surfaces of the first playback unit and the second playback unit are faced to an inner circumference of the head band, when the headphone is operated under the headphone mode, the second audio source interface is blocked behind by the fork portion. 
 
     
     
       2. The headphone with speaker function as claimed in  claim 1 , wherein when the headphone is operated under the speaker mode, the first playback unit and the second playback unit are swung in corresponding to the fork portion so that the sound output surfaces are faced outward, and the second audio source interface is exposed to be inserted by the external audio interface. 
     
     
       3. The headphone with speaker function as claimed in  claim 1 , wherein the amplifier circuit includes two differential amplifiers which are electrically connected to the first speaker and the second speaker respectively. 
     
     
       4. The headphone with speaker function as claimed in  claim 1 , wherein the first audio source interface is a three poles socket or a four poles socket. 
     
     
       5. The headphone with speaker function as claimed in  claim 4 , wherein the external audio interface is a three poles plug or a four poles plug, so that the audio signal can be transmitted to the first audio source interface or the second audio source interface. 
     
     
       6. The headphone with speaker function as claimed in  claim 1 , wherein the second audio source interface is a three poles socket or a four poles socket. 
     
     
       7. The headphone with speaker function as claimed in  claim 6 , wherein the external audio interface is a three poles plug or a four poles plug, so that the audio signal can be transmitted to the first audio source interface or the second audio source interface.